631691705279 has 4 divisors (see below), whose sum is σ = 637595366184. Its totient is φ = 625788044376.

The previous prime is 631691705257. The next prime is 631691705329. The reversal of 631691705279 is 972507196136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631691705279 - 2²⁴ = 631674928063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631691705479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2951830292 + ... + 2951830505.

It is an arithmetic number, because the mean of its divisors is an integer number (159398841546).

Almost surely, 2^631691705279 is an apocalyptic number.

631691705279 is a deficient number, since it is larger than the sum of its proper divisors (5903660905).

631691705279 is a wasteful number, since it uses less digits than its factorization.

631691705279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5903660904.

The product of its (nonzero) digits is 4286520, while the sum is 56.

The spelling of 631691705279 in words is "six hundred thirty-one billion, six hundred ninety-one million, seven hundred five thousand, two hundred seventy-nine".